package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //file是一个临时文件，需转存到指定位置，否则请求完成后文件消失
        log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix=originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID随机生成文件名避免重复
        String fileName= UUID.randomUUID().toString()+suffix;
        //创建目录
        File dir=new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }


        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            FileInputStream fileInputStream=new FileInputStream(basePath+name);

            ServletOutputStream outputStream=response.getOutputStream();

            response.setContentType("image/jpeg");

            int len=0;
            byte[] bytes=new byte[1024];

            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0, len);
                outputStream.flush();
            }
            fileInputStream.close();
            outputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
